2,2′‐Diamino‐6,6′‐diboryl‐1,1′‐binaphthyl: A Versatile Building Block for Temperature‐Dependent Dual Fluorescence and Switchable Circularly Polarized Luminescence |
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Authors: | Zuo‐Bang Sun Jun‐Kai Liu Da‐Fei Yuan Zheng‐Hua Zhao Xiao‐Zhang Zhu Di‐Hong Liu Qian Peng Cui‐Hua Zhao |
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Abstract: | Temperature‐dependent dual fluorescence and switchable circularly polarized luminescence (CPL) are two highly pursued but challenging properties for small organic molecules (SOMs). We herein disclose a triarylborane π‐system based on a 2,2′‐diamino‐6,6′‐diboryl‐1,1′‐binaphthyl scaffold that can serve as a versatile building block for achieving these two properties by simply choosing different amino groups. BNMe2‐BNaph with less bulky dimethylamino groups displays temperature‐dependent dual fluorescence, and can thus be used as a highly sensitive ratiometric fluorescence thermometer. On the other hand, BNPh2‐BNaph with bulky diphenylamino groups exhibits intense fluorescence in both solution and in the solid state. A change of solvent from nonpolar cyclohexane to highly polar MeCN not only shifts the CPL position to much longer wavelength but also inverts the CPL sign. In addition, the complexation of BNPh2‐BNaph with fluoride greatly enhances the CPL intensity. |
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Keywords: | 1 1′ -Binaphthyl-Gerü ste Intramolekularer Ladungstransfer Temperaturabhä ngige duale Fluoreszenz Triarylborane Zirkular polarisierte Lumineszenz |
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